A compact and highly efficient intracavity frequency- doubled green laser has been researched and designed based on periodically poled lithium niobate (PPLN) crystal. The laser system adopts a 808 nm laser diode (LD) end directly pumped Nd∶YVO4 crystal, then uses a poling period of 7 mm of PPLN crystal to generate 532 nm green light by frequency-doubling. The coating Nd∶YVO4 and PPLN crystals compose a laser cavity, without using any discrete optical components such as optical lens, reflector, thus reducing the volume and cost of the system. The experimental results show that with the resonator cavity length being set at 12 mm, pump power at 4.1 W, the green light output power of 1.343 W and the corresponding optical- optical conversion efficiency of 32.8% are achieved. Controlling the incident pump power at about 3.33 W, the fluctuation of green light output power within 2 h is less than 2%.